261242229 has 8 divisors (see below), whose sum is σ = 366655840. Its totient is φ = 164995056.

The previous prime is 261242221. The next prime is 261242263. The reversal of 261242229 is 922242162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261242229 - 2³ = 261242221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261242196 and 261242205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261242221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2291542 + ... + 2291655.

It is an arithmetic number, because the mean of its divisors is an integer number (45831980).

Almost surely, 2^261242229 is an apocalyptic number.

It is an amenable number.

261242229 is a deficient number, since it is larger than the sum of its proper divisors (105413611).

261242229 is a wasteful number, since it uses less digits than its factorization.

261242229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4583219.

The product of its digits is 6912, while the sum is 30.

The square root of 261242229 is about 16162.9894821472. The cubic root of 261242229 is about 639.2652937773.

The spelling of 261242229 in words is "two hundred sixty-one million, two hundred forty-two thousand, two hundred twenty-nine".